drwho1986: Welcome to SR. You will find a lot of wisdom here. My advice is to read the stickies at the top, especially the one that has "10 Ways Family Members Can Help a Loved One with a Drug or Alcohol Problem."
My advice also is that before you approach your family about how to handle this thing with your brother that you do your own homework and educate yourself about addiction and the best ways for family members to help their addicted loved one. There is a lot to this thing we call addiction! There is also the 12-step group for family members called "Alanon" or another group called "Naranon" that is a great source of support.
Good luck. Keep coming back! Pretty soon you'll find yourself giving advice to people in the same boat you are!